Truck mountable belt winder



FIG. 1 is a front and top perspective view of a truck mountable belt winder showing my new design;

FIG. 2 is a top plan view, with the bottom plan view being a mirror image thereof;

FIG. 3 is a left side view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a rear view thereof; and,

FIG. 6 is a front view thereof. 

The ornamental design for a truck mountable belt winder, as shown and described. 